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Polypropylene (PP)/bamboo fiber (BF) composites were fabricated by twin screw extruder in order to investigate effects of the compatibilizer on physical properties of PP/BF composites. The content of BF changed from 10 to 25 wt% and that of the compatibilizer was fixed at 3 wt%. Maleic anhydride grafted PP (PP-g-MAH) was used to increase the compatibility be- tween PP and BF as a compatibilizer. Chemical structures of the composites were confirmed by the existence of carbonyl group (C=O) stretching peak at 1,700 cm -1 in FT-IR spectrum. Considering the degradation and mechanical properties, the optimum extrusion conditions were selected to be 210 ℃ and 100 rpm, respectively. There was no distinct changes in melting temperature of the composites, but the crystallization temperature increased by 10-20 ℃ owing to the heterogeneous nuclei of BF. It was checked that the optimum BF content was in the range of 15-20 wt% from the results of tensile and flexural properties of the composites. The effect of the compatibilizer on mechanical properties was confirmed by SEM images of fractured surface and contact angles.

Effect of the Compatibilizer on Physical Properties of Polypropylene (PP)/Bamboo Fiber (BF) Composites